Combined latch and weft detector for loom transferrers



- 1,621,044 Ma 1927' K. J. UNWIN COMBINED LATCH AND WEFT DETECTOR FOR LOOM TRANSFERRERS Filed July 21, 1926 v -[Himlllllllllmlllllfllllll Patented Mar. 15, 1927.

rennet KENNETH J. UNVIINfOF sHREwsBU HY,MASSACHUSETTS, ASSIGNOR TO CROIVJ'.Ilitl. ON 8:

"KNG'W'LES LOOIVI WORKS, MASSACHUSETTS.

or won-enema, MASSACHUSETTS, A oo'nronnrronpr COMBINED-LATCH AND WEFT DETECTOR FOR LOOM TRANSFER/REES.

Application filed July 21,

This invention relates to improvements in weft detectors of the type mounted on regularly moving transfer-rel arms and it is the principal object of the invention to simplify the mechanism intermediate the detector and the'replenishing mechanism to the end that a mininnnn-number of parts may be employed.

Patent No. 1,372,316 to Byon shows a loom having a regularlylmoving transferrer arm with-a weft detector supported thereon, the detector-being presented to the surface to be detected on alternate beats of the loom by a downward movement of the transferrer arm. 'In co-pending application Ser. No. 78,181'filed by Hume there is shown a somewhat similar mechanism wherein the indicating plunger is normally held in locked position by a latch pivoted on the transterrer arm, the latch being movable to, unlocking position at the-time: of weft exhaustion by engagement with the detector. In the Hume construction the detector ismounted on a lever pivoted to the transt'errer arm and isout of contact and independentwith respect to the latch at all times except when an indication of weft exhaustion is being given. It is a further objectof my invention to combine thelatch .and detector and give these two devices a common support.

It is a further object of my invention to providea side slip weft detector movably mounted with respect to the latch and deriving its operative inoveme'nt from the energy storedtherein due to its downward movement by the transferrer arm. In this respect my present-invention embodies certain features set forth in co-pending application Ser. No. 120,491 filed by Turner.

,rl/Vith these and other objects in view which willappear as the description'proceeds, my-inv'ention resides in the combina-, tion and arrangement ofpa'rts hereinafter describedand-set forth in the claims. 'Inthe accompanying drawings wherein-I haveshowna convenient embodiment of my invention,

Fig. 1 is a vertical section through that portion of thentransferrer arm which normally lies over the shuttle and bobbin and showing myrinvention in the position it as- 1926. Serial no. 124,044.

sumes when contacting with asuflicient supply ot weft,

.lFig. 2 is a view similar to Fig. "l'but with the detector. shown in indicating position with insufiicient weft present,

Fig. 3 is-a detail top plan view of a port-ionof the transferrer the-direction of arrow SFig. 2, and

Fate arm looking in Fig. 4;is a detail section on line 44.- of

F 1g. 2. Referring to the drawings it will be seen that I have provided a transferrer arm 10 having a. portion 11 which extends over and substantially parallel ';to the bobbin and shuttle when the latter is boxed. A controller plunger l2 is slidajbly mounted in the portion 11 and has a shoulder 13which receives the inward thrust of a. compression spring 1% the outer end of which bears against that part of portion 11 which defines the left'handjend of a chamberi5 as viewed in Fig. 1 in which the plunger moves. Said plunger has a reduced end 16 provided with a pin 17 which engages a part of the transferrer arm to limit right hand movement of the plunger and said reduced end is provided with a notch 18 and a head 19. i i i A latch 20 having a hooked end 2l'to enter the notch 18 is pivoted on a pin 22, the parts normally being in the position shown in Fig. 1 with the hook 21 holding the plunger 1-2 so that the right hand end ofthe latter is substantially flush with the adjacent face of the transferrer arm. Said as shown inthe aforesaid patent. The;

matter thus far described is old andfor'ms no part of my invention. 7

In carrying'my improvements into-effect I provide'the latch-20 withja groove 30 diagonally disposed as shown in- Fig. 1 and I further provide the latch with aiplate 31 riveted or otherwise secured to the-latch. to define with the groove 30 slot to receive the upwardly extending shank 32 of a weft detector 33 provided with weft engaging teeth 34. An extension'35 of the detector has'securedthereto the lower end ofatension spring '36 the upper end of which is held to a wall 37 of the transferrer arm.

Under normal conditions the parts are in the position indicated in dotted lines in Fig. 1, the spring 36 holding the detector 33 in raised position and serving also to hold the hook 21 in the notch 18. On each downward movement of the transferrer arm 10 the latter is brou ht to a sudden stop but the detector, being ree to slide on the latch against the action of comparatively light spring 36, will continue to move toward the yarn on the bobbin after the transferrer has come to rest. When sufficient yarn is present the teeth will be embedded therein and further movement of the detector will be prevented. When insufficient weft is present, however, the detector, upon striking a bare bobbin, will continue its downward movement and slide along the bare bobbin, as is indicated in Fig. 2, this motion resulting in an angular movement of the latch about the pin 22. The hook 21 is therefore raised and the spring 1% will move the plunger 12 to the position indicated in Fig. 2 which, as set forth in the aforesaid patent to Ityon, corresponds to an indicating movement to initiate replenislr.

ment as the transferrer arm ascends. Immediately after the indicating movement has been completed the spring 36 will tend to restore the detector to the position indicated in Fig. 1 and will also act to create a slight pressure between the hook 21 and the head 19 so that as the plunger 12 is moved to the left on the ascending movement of the transferrer arm as is set forth in the aforesaid patent to Ryon said hook will enter the notch 18.

t From the foregoing it will be seen that I have provided a very simple weft detector depending for its actuation on the energy stored in a moving part and having but one spring which serves not only to return the detector to normal position but also insures proper co-action between the latch and the plunger 12. It is to be understood that the detector may be made of any approved material such as will reduce friction to a minimum as the detector slides on the latch. It will further be seen that I have provided a combined detector and latch which is connected to the transferrer arm by a single means of support, namely, the pin 22.

Having thus described my invention it will be apparent that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope'of the invention, and I do .not wish to be limited to the details herein disclosed but what I claim is:

1. In a weft detector for a loom having a transferrer arm receiving a regular movement at periodic intervals toward a weft surface to be detected, a controller on the transferrer arm, a latch normally holding the controller in inoperative position, and a weft detector mounted on the latch and having an operative movement each time the transferrer arm moves toward the surface to be detected and tending to move the latch to a position to release the controller. 2. In a weft detector for a loom having a transferrer arm receiving a regular movement at periodic intervals toward a weft surface to be detected, a controller on the transferrer arm, resilient means tending to move the controller to operative position, a latch movably mounted on the transferrer arm and operatively related to the controller to hold the latter normally in inoperative position, and a weft detector'movably mounted on the latch and having a'movement on each detecting beat of the loom tending to move the latch to controller releasing position, said detector being restrained from moving the latch when sufficient weft is present and being operative to give the latch a releasing movement when insuficient weft is present.

3. In a weft detector for a loom having a transferrer arm receiving a regular movement at periodic intervals toward a weft surface to be detected, a controller on the transferrer arm, a latch normally holding the controller in inoperative position,-aweft detector slidably mounted on the latch and disposed obliquely with respect to the surface to be detected, said detector tending to move the latch to controller releasing position on each movement of the transferrer arm toward the surface to be detected, releasing movement being prevented when the detector engages a suflicient supply of weft and the detector sliding along a substantially exhausted bobbin to give movement to the latch to cause the latter to release the controller. 4. In a weft detector for a loom having a transferrer arm receiving a regular movement at periodic intervals toward a weft surface to be detected, a controller on the transferrer arm, a latch pivoted to the transferrer arm and having a hooked portion to cooperate with a notch in the controller, a

weft detector slidably mounted on the latch l and having a pivotal movement with the latter, and a single resilient means interposed between the detector and the transferrer arm tending to hold the hooked part of the latch in the notch of the controller and tending also to hold the detector in'normal position, said detector moving toward the surface to be detected each time the transferrer is pre- 5. In a weft detector for a loom having a transferrer arm receiving a regular movement at periodic intervals toward a weft surface to be detected, a controller on the transferrer arm, a latch normally holding the controller in inoperative position, a detector slidably mounted on the latch, resilient means connected to the detector and tending to preserve locking engagement between the latch and the controller and also serving to hold the detector yieldingly in normal position, and a pivotal connection between the latch and the transferrer arm, said detector tending to move the latch about the pivot of the latter to release the controller each time the transferrer arm is moved toward the surface to be detected, the detector being prevented from having such motion when suflicient weft is present and said detector moving angularly aboutthe pivot of the latch and moving the latter to controller releasing position when insufficient weft is present.

6. In a weft detector for a loom having a transferrer arm receiving a regular movement at periodic intervals toward a weft surface to be detected, a controller on the transferrer arm, a latch for the controller normally holding the latter in inoperative position, and a detector slidably mounted on the latch and yieldingly held away from the surface to be detected, said detector being obliquely disposed with respect to the surface to be detected and tending to move rela tively to the latch after the transferrer arm has come to rest in its movement toward the surface to be detected by reason of the energy stored in the detector due to the movement of the transferrer arm, said detector when engaging a sufficient supply of Weft being restrained against movement in the.

direction of the length of the surface to be detected but said detector when engaging a substantially exhausted surface moving along the latter to impart movement to the latch to move the same relativelyto the controller and release the latter.

7 In a weft detector for a loom having a transferrer arm receiving a regular movement at periodic intervals toward a weft surface to be detected, a controller on the transferrer arm, a latch to hold the controller normally in inoperative position, a detector mounted on and movable with respect to the latch in a direction toward and from the surface to be detected, said detector tending to move toward the surface to be detected by reason of the energy stored therein after the transferrer arm has come to rest in its movement toward the surface to be detected, the detector being arrested in movement along the surface when suflicient weft is present to impart movement to the latch to cause the latter to release the plunger, and a single resilient means operatively connected to the detector and acting to restore the latter to normal position and also to preserve holding engagement between the latch and the controller.

8. In a weft detector for a loom having a transferrer arm receiving a regular movement at periodic intervals toward a weft surface to be detected, a controller on the transferrer arm, a latch normally holding the controller in inoperative position, a weft detector mounted on the latch and having an operative movement each time the transferrer arm moves toward the surface to be detected and tending to move the latch to a position to release/the controller, and a single resilient means connected to the detector and serving to move said de-' tector to normal position and also preserve holding engagement between the latch and I controller.

In testimony whereof I have hereunto affixed my signature. KENNETH J. UNWIN. 

